本文应用断裂力学及电化学等方法,研究了通过不同回火温度处理具有不同强度水平的34CrNi3Mo和40CrNiMo钢在人造海水中的腐蚀疲劳(CF)和应力腐蚀开裂(SCC)行为。试验结果表明,钢的强度对CF和SCC行为有着强烈的作用。随着钢屈服强度σ_s的提高,钢在海水中的SCC敏感性增大,腐蚀疲劳裂纹扩展速率dα/dN剧增。低合金钢在海水环境中的CF行为与SCC行为密切相关,而在CF条件下可促进钢的SCC敏感性。
The corrosion fatigue (CF) and stress corrosion cracking (SCC)behaviour of steels 34CrNi3Mo and 40CrNiMo with different strength grades dealt with various tempering treatments has been investigated in artificial seawater using the fracture mechanics and electrochemical methods. Experimental results showed that the SCC susceptibility of the steel in seawater is increased and the CF crack propagation rate, da/dN, is sharply raised with the increase of its YS. For the steels of YS over 890 MPa, tempered less than 650℃, the da/dN vs △K plot appeared a plateau, in which the(dN/da)_(11) kept almost constant and its fracture surface was similar in shape to that of SCC. It is believed that the CF behaviour is close related to the SCC and the SCC Susceptibility of the steel is promoted under the CF condition.
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